Is % based spell damage like Liandry's Torments passive or Amumus Despair (W) affected by Magic Resistance? Same goes with Botrk and armor.
League-of-legends – Does Armor/Magic Resist affect percentage damage
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Best Answer
Yes it is !
The % damage in those effects is doing magic damage once calculated, so let's say its 10% magic dmg on 1000hp, then the result will be 100dmg, to which you apply the % of magic resistance so to finish the example let's say 50% magic resist. You apply this 100dmg x 50% MR = 50dmg.
That's amumu Despair skill (the W), as you can see it clearly is magic damage once calculated, so resistance apply to it.
And that is vayne's W, where it is stated that it is true damage, so no resistance is applied
I just noticed you asked for botrk too, sorry. It will work exactly the same way but with armor as the % from botrk is calculated as physical damage. So once the % is calculated based on target's hp, the % damage reduction from armor will apply. So, botrk is really efficient against high hp, low armor champions, but if they start to build a lot of armor you will need a black cleaver or a last whisper to penetrate armor if you want the effect of botrk to still be important.